What makes you think his claim of suffering brain damage is BS?
I'm a neuropsychologist when I'm not being a football dork. The evidence to support CTE is really shaky and is mostly being advanced by a group in Boston whose financial and career interests benefit from telling this alarming story, and the media in turn love creating hysteria about it, as well.
There are likely a lot of things going on that cause CTE, that contribute to behavioral disturbances, and are associated with suicide. Way down on the list would be concussions, according to most neurologists, neuropsychologists, and other scientists/clinicians in our related professions. In Hargrove's case, I have a hard time taking his claim seriously, given that he's now decided to return to the environment that supposedly caused him permanent harm. I not only don't buy it, but it actually rankles me quite a bit.
Bottom line, this CTE business is a money grab for everyone involved.